Especially with 250gsm and 300 gsm, which are quite a stiff cards. CIE Whiteness (ISO 11475) - 145%. GSM is the weight of the paper, not the thickness. A3 297mm x 420mm (11.7" x 16.5"). A4 210mm x 297mm (8.3" x 11.7").
Especially with 250gsm and 300 gsm, which are quite a stiff cards. A5 148mm x 210mm (5.8 x 8.3). A2 420mm x 594mm (16.5 x 23.4). GSM is the weight
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CARDSTOCK A4 SIZE: 8.27 x 11.69 a4 cardstock, heavyweight cardstock, 74lb cover cardstock, 200 GSM with 92 brightness and 120 sheets/pack, so you
120 Sheets A4 White Cardstock Thick Paper, 74lb White Card Stock Printer Paper, Heavy Weight Cover Card Stock (200 GSM) for Invitations, Wedding
A6 A5 A4 A3 A2 WHITE CRAFT DECOUPAGE CARD MAKING PAPER SHEETS PRINTER 120 300gsm ÂŁ1.80 - PicClick UK